Optimum Nutrition Gold Standard Natural 100% Casein Protein has 24g of instantized, slow-digesting micellar casein to help refuel recovering muscles. Slow digestion and absorption may be more beneficial at other times - including bedtime when your body typically goes for hours without food.

Casein proteins are acid sensitive and thicken in the stomach. Faster digesting protein is desirable immediately before and after exercise Compared to some other proteins, it can take longer for Naturally Flavored Gold Standard 100% Casein to be broken down into its amino acid subcomponents. By using only premium micellar casein as a protein source, Optimum Nutrition created a formula that sets the standard for slow digesting protein support.